Combined sink and drainboard unit



FIG. 1 is a top plan view of a combined sink and drainboard unit showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a front elevational view thereof, the rear being a mirror image of the front shown;

FIG. 4 is a side elevational view thereof, the opposite side being the same as the side shown; and

FIG. 5 is a bottom isometric view thereof. 

The ornamental design for a combined sink and drainboard unit, as shown and described. 